and are almost interchangeable in Japan. I think was more common than at least before Joker's movie. Since Japanese do not distinguish l and r, I imagine "crown" which is an ornament for the king more often than "clown" which is an actor in a circus. Maybe people see juggling ball in a pachinko game setting.
However Halloween gets popular in Japan in this decade and a costume play is often influenced by movie, I am not so sure about how the term really used for younger generations.
is the most traditional one for a circus clown you imagine.